﻿<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
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</head>
<body>
    <div class="container bg-info">
        <div style="width:100%;  height:3000px;">
            页面向下滚动一定程度右下角会出现返回顶部按钮。<br />
            点击返回顶部，可以感觉到平滑滚动效果
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</body>
</html>
